Window cleaning robot



FIG. 1 is a front elevational view of a window cleaning robot showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a rear perspective view thereof; and,

FIG. 8 is a front perspective view thereof.

The broken lines depict environment that forms no part of the claimed design. 

CLAIM The ornamental design for a window cleaning robot, as shown and described. 